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From Robert McLachlan   21 February 1868

Summary

On numerical proportions of sexes in insects; coloration. Dimorphism in dragonflies (Agrion) in which usual coloration is reversed in sexes [see Descent 1: 362–4].

Wallace seems to ride his hobby too hard.

Author:  Robert McLachlan
Addressee:  Charles Robert Darwin
Date:  21 Feb 1868
Classmark:  DAR 86: A8–9, DAR 82: A88–9
Letter no:  DCP-LETT-5910

From Robert McLachlan   24 February 1868

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Summary

Reports that when August Meyer confined several distinct species of Phryganeidae they coupled and produced fertile ova, indicating that some specific characters are not so important so far as reproduction is concerned [see Descent 1: 342 n. 2].

Author:  Robert McLachlan
Addressee:  Charles Robert Darwin
Date:  24 Feb 1868
Classmark:  DAR 82: A86–7
Letter no:  DCP-LETT-5924
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letter (2)
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McLachlan, Robertdisabled_by_default
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Darwin, C. R.disabled_by_default
McLachlan, Robertdisabled_by_default